大型敞口钢油罐结构风荷载试验与风力稳定分析

Wind load test and buckling analysis of large steel open-top tanks

对大型敞口钢油罐进行风荷载的风洞试验,获得结构表面的风荷载分布规律,并拟合成傅里叶公式,为设计应用提供方便.利用风洞试验获得的风荷载对大型敞口油罐进行稳定计算,研究了罐壁顶部包边角钢与结构风力稳定的关系,分析了初始几何缺陷对结构非线性稳定性能的影响.结果表明:大型油罐这类高径比很小的低矮型圆柱结构的表面风荷载与普通圆柱结构的有明显差异;包边角钢可以加强油罐顶部的迎风面外刚度,提高结构屈曲的临界风荷载;敞口钢油罐的风力稳定性能对初始几何缺陷十分敏感,结构的稳定承载力随缺陷的增大显著降低.

Wind tunnel test was carried out to obtain the wind loads on the cylindrical wall of large steel open-top tanks,which was then fitted by Fourier formula for design.Stability behavior under wind loads obtained from the wind tunnel test was studied using bifurcation analysis and non-linear analysis.The angle ring stiffener on the top of the cylindrical wall was included,and the effect of initial geometric imperfections on stability behavior was analyzed through geometrically non-linear analysis.It is shown that wind pressures on cylindrical wall with very low aspect ratio are different from those with taller aspect ratios,and the angle ring stiffener on the top can strengthen the wind-resistant stiffness out of plane and increase the buckling loads.Wind loaded steel open-top tanks are very sensitive to initial geometric imperfections which remarkably reduce the buckling loads.